访问fields_for hidden_​​field的Rails ID

Question

我通过has_many关联有一个父对象（full_application）和一个子对象集合（fullapplication_districts）的嵌套表单。我试图允许删除窗体上的单个子对象（通过JavaScript），但要做到这一点，我需要能够获取视图中的每个子对象的ID传递给控制器​​。 fields_for为id创建一个隐藏的输入字段，但我似乎无法弄清楚如何从中获取id。在下面的例子中，记录是呈现的子对象列表中的第13位。

<input type="hidden" value="538" name="full_application[fullapplication_districts_attributes][12][id]" id="full_application_fullapplication_districts_attributes_12_id"> 

这里的视图的形式设置：

<%= form_for(@full_application, url: full_applications_edit_path, method: :put) do |f| %> 
    <%= f.fields_for :fullapplication_districts do |fad| %> 
    <%= fad.collection_select :district_id, District.all, :id, :name, {include_blank: true}, {class: 'form-control'} %> 
    <%= fad.number_field :percent_one, class: 'form-control', step: :any %> 
    <%= fad.number_field :percent_two, class: 'form-control', step: :any %> 
    <%= fad.number_field :percent_three, class: 'form-control', step: :any %> 
    <%= link_to full_applications_districts_path(???), method: :delete, remote: true, data: { confirm: "Are you sure you want to delete this record?" } do %> 
     <i class="fa fa-trash"></i> 
    <% end %> 
    <% end %> 
<% end %> 

Answer 1

您可以使用：fad.object或fad.object.id。这将返回到fullapplication_district实例。

<%= link_to full_applications_districts_path(fad.object), method: :delete, remote: true, data: { confirm: "Are you sure you want to delete this record?" } do %> 
    <i class="fa fa-trash"></i> 
<% end %>